Probing environment and circumstellar disk evolution in triggered star forming regions: IRAC and MIPS imaging of bright-rimmed globules CG4/SA101 and CG30/31

Details Probing environment and circumstellar disk evolution in triggered star forming regions: IRAC and MIPS imaging of bright-rimmed globules CG4/SA101 and CG30/31 Probing environment and circumstellar disk evolution in triggered star forming regions: IRAC and MIPS imaging of bright-rimmed globules CG4/SA101 and CG30/31

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20714k&link_type=abstract

Spitzer Proposal ID #20714

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Scientific paper

We propose to obtain IRAC and MIPS images of a newly discovered star forming region, cometary cloud complex CG~4/SA101 (Kim et al. 2005c). We also propose to acquire more complete IRAC and MIPS images of a cometary globule complex CG~30/31, where we found young stars (Kim et al. 2005a,c), but existing program by a Spitzer legacy team (c2d) did not observe. Both star forming complexes reside in the Gum Nebula, where early O stars, Wolf-Rayet star, supernovae remnants, and OB associations produce strong ionizing UV photons. These two star forming regions are in a photoevaporating cometary shaped bright-rimmed clouds, at few tens of parsecs away from the common center of main ionizing sources in the Gum Nebula, placing them in a 'intermediate' UV radiation field between Orion-like Strong radiation field regions and Taurus-like weak radiation field regions. We propose to perform comparative and statistical studies probing circumstellar disk characteristics and evolution in different star forming environments together with existing data of well-known star forming regions. The age range of the young stars in these regions (1-5 Myr old) is also of a great interest, because this is a time when transition from optically thick disks to optically thin debris disks occurs. Therefore, this proposed observations will provide an important dataset to study lifetime of inner disks and optically thick disk evolution in such environments. We probe yet another common mode of star formation, forming in groups in triggered mode or influenced by UV photons from nearby ionizing sources. Our dataset and study will contribute to a better understanding of star formation and circumstellar disk evolution linking well-known star forming regions in weak and strong radiation field environments. We believe that this dataset will also benefit other star formation and disk communities for various other studies in addition to existing dataset of clusters and associations, obtained by GTO, legacy, and GO1.

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